simple switching power supply by LM393
I built a PCB for a simple switching power supply, originally designed by Keith Payea of the SRS. It uses an LM393, a P-channel power MOSFET, and darn little else. Since its frequency varies based on load (and nearly everything else imaginable), you can use junk-box parts and build it for cheap.
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read more source:
http://www.seanet.com/~karllunt/junkbox.htm
Thank you.
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